INFINITI QX4 2005 Factory Service Manual

EM-38Revision: October 2005
TIMING CHAIN
2005 QX56
9. Remove the oil pump. Refer to LU-13, "Removal and Installation" .
10. Remove the chain tensioner on the left bank using the following steps.
NOTE:
To remove the timing chain and associated parts, start with those on the left bank. The procedure for
removing parts on the right bank is omitted because it is the same as that for the left bank.
a. Squeeze the return-proof clip ends using suitable tool and push
the plunger into the tensioner body.
b. Secure the plunger using stopper pin.

Stopper pin is made from hard wire approximately 1 mm (0.04
in) in diameter.
c. Remove the bolts and chain tensioner.
WAR NIN G:
Plunger, spring, and spring seat pop out when (squeezing)
return-proof clip without holding plunger head. It may
cause serious injuries. Always hold plunger head when
removing.
NOTE:

Stop the plunger in the fully extended position by using the
return-proof clip 1 if the stopper pin is removed.

Push the plunger 2 into the tensioner body while squeezing
the return-proof clip 1. Secure it using stopper pin 3.
11. Remove the chain tension guide and slack guide.
12. Remove the timing chain and crankshaft sprocket.
13. Loosen the camshaft sprocket bolts as shown and remove the
camshaft sprocket.
CAUTION:
To avoid interference between valves and pistons, do not
turn crankshaft or camshaft when timing chain is discon-
nected.
14. Repeat the same procedure to remove the right timing chain and
associated parts.
INSPECTION AFTER REMOVAL
Check for cracks and any excessive wear at link plates. Replace
chain if necessary.

In the same way as for the left bank, inspect the timing chain
and associated parts on the right bank.
KBIA2479E
KBIA2483E
KBIA2513E
PBIC0282E

TIMING CHAIN
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INSTALLATION
NOTE:

The above figure shows the relationship between the mating mark on each timing chain and that of the
corresponding sprocket, with the components installed.

To install the timing chain and associated parts, start with those on the right bank. The procedure for
installing parts on the left bank is omitted because it is the same as that for installation on the right bank.
1. Make sure the crankshaft key and dowel pin of each camshaft
are facing in the direction as shown.
2. Install the camshaft sprockets.

Install the intake and exhaust camshaft sprocket by selec-
tively using the groove of dowel pin according to the bank.
(Common part used for both banks.)

Lock the hexagonal part of the camshaft in the same way as
for removal, and tighten the bolts.
KBIA2514E
SBIA0356E
KBIA2480E

EM-40Revision: October 2005
TIMING CHAIN
2005 QX56
3. Install the crankshaft sprockets for both banks.

Install each crankshaft sprocket so that its flange side (the
larger diameter side without teeth) faces in the direction
shown.
NOTE:
The same parts are used but facing directions are different.
4. Install the timing chains and associated parts.

Align the mating mark on each sprocket and the timing chain for installation.
CAUTION:

Before installing chain tensioner, it is possible to change the position of mating mark on tim-
ing chain and each sprocket. After the mating marks are aligned, keep them aligned by hold-
ing them by hand.

Install the slack guides and tension guides onto the correct side by checking the identification mark on
the surface.

Install the chain tensioner with the plunger locked in with the stopper pin.
CAUTION:

Before and after the installation of the chain tensioner, make sure that the mating mark on the
timing chain is not out of alignment.

After installing the chain tensioner, remove the stopper pin to release the tensioner. Make
sure the tensioner is released.

To avoid chain-link skipping of the timing chain, do not move crankshaft or camshafts until
the front cover is installed.
5. In the same way as for the right bank, install the timing chain and associated parts on the left side.
6. Install the oil pump.
7. Install the oil pump drive spacer as follows:

Install so that the front mark on the front edge of the oil pump
drive spacer faces the front of the engine.

Insert the oil pump drive spacer according to the directions of
the crankshaft key and the two flat surfaces of the oil pump
inner rotor.

If the positional relationship does not allow the insertion,
rotate the oil pump inner rotor to allow the oil pump drive
spacer to be inserted.
8. Install the front oil seal using suitable tool.
CAUTION:
Do not scratch or make burrs on the circumference of the
oil seal.
KBIA2515E
KBIA2490E
PBIC0059E

TIMING CHAIN
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9. Install the chain tensioner cover.

Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants"
.
10. Install the front cover as follows:
a. Install a new O-ring on the cylinder block.
b. Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants".
c. Check again that the timing mating marks on the timing chain
and on each sprocket are aligned. Then install the front cover.
d. Install the bolts in the numerical order shown.
e. After tightening, re-tighten to the specified torque.
CAUTION:
Be sure to wipe off any excessive liquid gasket leaking onto
surface mating with oil pan.
11. Install the chain case cover (right bank) and (left bank) as fol-
lows:
a. Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants".
CAUTION:
The start and end of the application of the liquid gasket
should be crossed at a position that cannot be seen after
attaching the chain case cover.
KBIA2547E
KBIA2516E
KBIA2517E
M6 × 50 mm (1.97 in) : No. 1, 20, 25, 26, 27
M6 × 80 mm (3.15 in) : No. 4, 5, 7
M6 × 20 mm (0.79 in) : Except the above
KBIA2478E
KBIA2481E

EM-42Revision: October 2005
TIMING CHAIN
2005 QX56
b. Install the bolts in the numerical order shown.
12. Install the crankshaft pulley.

Install the key of the crankshaft.

Insert the pulley by lightly tapping it.
CAUTION:
Do not tap pulley on the side surface where the belt is installed (outer circumference).
13. Tighten the crankshaft pulley bolt.

Lock the crankshaft using suitable tool, then tighten the bolt.

Perform the following steps for angular tightening:
a. Apply engine oil onto the threaded parts of the bolt and seating area.
b. Select the one most visible notch of the four on the bolt flange.
Corresponding to the selected notch, put a mating mark (such
as paint) on the crankshaft pulley.
14. Rotate the crankshaft pulley in normal direction (clockwise when
viewed from engine front) to check for parts interference.
15. Installation of the remaining components is in the reverse order
of removal.
WBIA0468E
Crankshaft pulley bolt torque
Step 1 : 93.1 N·m (9.5 kg-m, 69 ft-lb)
Step 2 : additional 90° (angle tightening)
KBIA2519E

CAMSHAFT
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CAMSHAFTPFP:13001
Removal and InstallationEBS00LM9
* Refer to GI-45, "Recommended Chemical Products and Sealants" .
REMOVAL
1. Remove the rocker cover (right bank) and (left bank). Refer to EM-33, "ROCKER COVER" .
2. Obtain compression TDC of No. 1 cylinder. Refer to EM-35, "
TIMING CHAIN" .
3. Remove the chain case cover (right bank) and (left bank). Refer to EM-35, "
TIMING CHAIN" .
4. Paint matching marks on the timing chain links aligning with the
camshaft sprocket matching marks.
1. Cylinder head (right bank) 2. Camshaft bracket (No. 2, 3, 4, 5) 3. Valve lifter
4. Camshaft bracket (No. 1) 5. Seal washer 6. Camshaft (right bank EXH)
7. Camshaft (right bank INT) 8. Camshaft (left bank INT) 9. Camshaft (left bank EXH)
10. Camshaft sprocket (right bank EXH) 11. Camshaft sprocket (right bank INT) 12. Camshaft sprocket (left bank INT)
13. Camshaft sprocket (left bank EXH) 14. Camshaft position sensor (PHASE) 15. O-ring
16. Cylinder head (left bank)
WBIA0469E
KBIA2488E

EM-44Revision: October 2005
CAMSHAFT
2005 QX56
5. Remove the chain tensioner on the left bank using the following steps.
WAR NIN G:
Plunger, spring, and spring seat pop out when squeezing return-proof clip without holding
plunger head. It may cause serious injuries. Always hold plunger head when removing.
a. Squeeze return-proof clip ends using suitable tool and push the
plunger into the tensioner body.
b. Secure plunger using stopper pin.

Stopper pin is made from hard wire approximately 1 mm (0.04
in) in diameter.
c. Remove the bolts and the chain tensioner.
NOTE:

Stop plunger in the fully extended position using return-proof clip
1 if stopper pin is removed.

Push the plunger 2 into the tensioner body while squeezing the
return-proof clip 1. Secure it using stopper pin 3.
6. Remove the right chain tensioner cover from the front cover
using Tool.
CAUTION:
Do not damage mating surfaces.
7. Remove chain tensioner on right bank using the following steps.
WAR NIN G:
Plunger, spring, and spring seat pop out when squeezing return-proof clip without holding
plunger head. It may cause serious injuries. Always hold plunger head when removing.
a. Squeeze return-proof clip ends using suitable tool and push the
plunger into the tensioner body.
b. Secure plunger using stopper pin.

Stopper pin is made from hard wire approximately 1 mm (0.04
in) in diameter.
KBIA2479E
KBIA2483E
Tool number : KV10111100 (J-37228)
KBIA2521E
KBIA2479E

CAMSHAFT
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c. Remove the bolts and the right bank chain tensioner.
NOTE:
If it is difficult to push plunger on right bank chain tensioner,
remove the plunger under extended condition.
8. Loosen camshaft sprocket bolts as shown and remove camshaft
sprockets.
CAUTION:
To avoid interference between valves and pistons, do not
turn crankshaft or camshaft with timing chain discon-
nected.
9. Remove the front cover bolts.
10. Remove bolts in the reverse of order shown to remove camshaft
brackets.

Remove No. 1 camshaft bracket.
NOTE:
The bottom and front surface of bracket will be stuck because
of liquid gasket.
11. Remove the camshaft.
12. Remove the valve lifters if necessary.

Correctly identify location where each part is removed from.
Keep parts organized to avoid mixing them up.
KBIA2484E
KBIA2485E
KBIA2486E
KBIA2522E

EM-46Revision: October 2005
CAMSHAFT
2005 QX56
INSPECTION AFTER REMOVAL
Camshaft Runout
1. Put V block on precise flat work bench, and support No. 1 and
No. 5 journals of the camshaft.
2. Set dial indicator vertically to No. 3 journal.
3. Turn the camshaft to one direction, and measure the camshaft
runout on the dial indicator (total indicator reading).

If measurement exceeds specification, replace the camshaft.
Camshaft Cam Height

Measure the camshaft cam height.

If measurement is not within the specifications, replace the cam-
shaft.
Camshaft Journal Clearance
Camshaft Journal Diameter

Measure the diameter of the camshaft journal.
Camshaft Bracket Inner Diameter

Tighten the camshaft bracket bolt to the specified torque.

Measure the inner diameter of the camshaft bracket.
Calculation of Camshaft Journal Clearance
(Journal clearance) = (camshaft bracket inner diameter) – (camshaft
journal diameter)

If measurement is not within specification, replace either or both
camshaft and cylinder head.
NOTE:
The inner diameter of the camshaft bracket is manufactured together with the cylinder head. Replace the
whole cylinder head as an assembly.Standard : Less than 0.02 mm (0.0008 in)
EMK0641D
Standard cam height
(intake & exhaust): 44.465 - 44.655 mm
(1.7506 - 1.7581 in)
Cam wear limit
(intake & exhaust): 0.02 mm (0.0008 in)
PBIC0039E
Standard diameter : 25.953 - 25.970 mm
(1.0218 - 1.0224 in)
PBIC0040E
Standard : 26.000 - 26.021 mm (1.0236 - 1.0244 in)
Standard : 0.030 - 0.068 mm (0.0012 - 0.0027 in)
PBIC1645E

CAMSHAFT
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Camshaft End Play

Install dial gauge in the thrust direction on the front end of the
camshaft. Measure the end play when the camshaft is moved
forward/backward (in direction to axis).

If measurement is out of the specified range, replace the cam-
shaft and measure again.

If measurement is still out of the specified range, replace the cyl-
inder head.

Measure the following parts if end play is outside the specified
value.
–Dimension "A" for camshaft No. 1 journal
–Dimension "B" for cylinder head No. 1 journal

If measurements are not within specification, replace the cam-
shaft and/or cylinder head.
Camshaft Sprocket Runout
1. Install the camshaft in the cylinder head.
2. Install the camshaft sprocket to the camshaft.
3. Measure the camshaft sprocket runout.

If measurement exceeds the specification, replace the cam-
shaft sprocket.
Valve Lifter
Check if the surface of the valve lifter has any wear or cracks.

If any damage is found, replace the valve lifter.

Select the thickness of the head so that the valve clearance is
within the standard when replacing. Refer to EM-51, "
Va l v e
Clearance" . Standard : 0.115 - 0.188 mm (0.0045 - 0.0074 in)
PBIC0042E
Standard : 30.500 - 30.548 mm (1.2008-1.2027 in)
Standard : 30.360 - 30.385 mm (1.1953-1.1963 in)
KBIA2426J
Runout : Less than 0.15 mm (0.0059 in)
KBIA0181J
KBIA0182E